Re: Single-bushing 14.7kV pigs. Thoughts?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: DRIEBEN-at-midsouth.rr-dot-com 

Hi Dr,

While this may indeed pose a problem with true coaxial style cable, I know
from experience that this was not a problem with HV x-ray cable. I used about
18 ft. of x-ray cable for the transmission line between my pig and the coil
and I never experinced the "Blumline effect" with this setup. Of course,
x-ray cable also has a carbon based simiconductor tape wrapped around the
thick rubber insulation between the the rubber insulation and the grounded
outer metal braiding and I'm thinking that this may be the key as to why
the Blumline effect is not noticed in this situation. Just guessing here,
though.

David Rieben

----- Original Message -----
From: Tesla list <tesla-at-pupman-dot-com>
Date: Monday, February 9, 2004 9:01 am
Subject: Re: Single-bushing 14.7kV pigs.  Thoughts?

 > Original poster: "Dr. Resonance" <resonance-at-jvlnet-dot-com>
 >
 >
 >>
 > I also want to share with the group something to never do:  On an
 > early pig
 > xmfr we used a coax cable to connect both the hot and ground
 > approx 12 feet
 > over to the coil.  When we fired the coil up the capacitance
 > formed a
 > powerful resonance with the xmfr's inductance.  The result was hot
 > longsparks that fired across the entire large 14.4 kV bushing on
 > the xmfr.  It
 > formed a sort of blumlein and developed over 125 kV across the
 > bushing!
 > Dr. Resonance